空气源热泵分段除霜性能研究  

Study on the Segmental Defrosting Performance of Air-source Heat Pumps

作　　者：黄韬 唐兰[1] 陈海 刘西安 覃秋圆 刘梓源 李宝茵 Huang Tao;Tang Lan;Chen Hai;Liu Xi′an;Qin Qiuyuan;Liu Ziyuan;Li Baoyin(School of Civil Engineering,Guangzhou University,Guangzhou,510006,China)

机构地区：[1]广州大学土木工程学院,广州510006

出　　处：《制冷学报》2023年第4期112-119,共8页Journal of Refrigeration

摘　　要：本文提出一种空气源热泵分段除霜方法,该系统将室外侧换热器分为3段,利用除霜控制阀对每一分段进行单独除霜控制,其余两段保持正常蒸发吸热。对分段除霜进行实验研究,并与逆循环除霜进行对比。结果表明:在环境温度为1℃、相对湿度为80%、冷凝温度为40℃的工况下,逆循环除霜时间为246 s,比分段除霜的330 s更短;逆循环除霜能耗为522.1 kJ,比分段除霜735.8 kJ更低。但逆循环除霜需要从水侧换热器中吸收热量,而分段除霜过程中能够保持平均2.23 kW的制热性能,且吸、排气压力波动较小、COP降幅较缓,能够实现机组除霜期间不间断制热运行。In this study,a novel defrosting method was developed for an air-source heat pump(ASHP)with a multi-circuit outdoor coil operating in a low-temperature and high-humidity environment.The outdoor heat exchanger of the ASHP is divided into three independent circuits for segmental defrosting.When a defrost operation is required,one of the circuits uses part of the high-temperature gas at the compressor outlet to defrost.At this time,part of the high-temperature gas still enters the indoor heat exchanger for heating,while the other two circuits of the outdoor heat exchanger are used as evaporators.The novel segmental defrosting method was compared with the traditional reverse cycle defrosting(RCD),and the results indicated that the overall performance of the system was better than that of RCD.Under the conditions of ambient temperature of 1℃,relative humidity of 80%,and condensing temperature of 40℃,the reverse cycle defrosting time is 246 s,which is shorter than the segmental defrosting time of 330 s.Further,the energy consumption of reverse circulation is 522.1 kJ,which is lower than that of 735.8 kJ for segmental defrosting.However,reverse cycle defrosting needs to absorb heat from the water-side heat exchanger.An average heating performance of 2.23 kW can be maintained during the defrosting process,with small fluctuations in suction and exhaust pressure and a slow decline in COP,and a continuous heat supply can be achieved during the defrosting process.

关 键 词：空气源热泵 热力学 分段除霜方法 除霜特性 

分 类 号：TB657.5[一般工业技术—制冷工程] TK123[动力工程及工程热物理—工程热物理]